Mobile desk unit



FIG. 1 is a perspective general view of a mobile desk unit, showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a top view of the mobile base of the mobile desk unit.

FIGS. 2 through 5 are shown at a reduced scale. 

The ornamental design for a mobile desk unit, as shown and described. 